[{"title":"( 2 个子文件 6.71MB ) pcb设计电磁兼容(pdf版)","children":[{"title":"电磁兼容","children":[{"title":"电磁兼容和印刷电路板 理论、设计和布线.pdf <span style='color:#111;'> 6.82MB </span>","children":null,"spread":false},{"title":"打开口令.txt <span style='color:#111;'> 20B </span>","children":null,"spread":false}],"spread":true}],"spread":true}]